[SOLVED] Can't access texture in shader

[uzadow]

Hi, I have a simple custom material that should be rendered in the forward pass, and I can't seem to access the texture I pass in. Currently, the object appears black, when it should be displaying the texture. Simply writing the texture coordinates to the frag color gives a correct result, though.

Any idea why this is? Where am I going wrong?

This is my material definition:

<?xml version="1.0" encoding="utf-8"?>
<base_material version="2.0" name="video_texture" editable="0" parameters_prefix="m">

  <options transparent="2"/>
  
	<!-- States -->
	<state name="ambient">1</state>
	
	<!-- Deferred rendering shaders -->
	<shader pass="ambient" node="object_mesh_static"
		ambient="1"
		defines="BASE_AMBIENT"
		vertex="shaders/video_texture.vert"
		fragment="shaders/video_texture.frag"/>
	
	<!-- Bindings -->
	<bind node="object_mesh_dynamic" to="object_mesh_static"/>
	<bind node="object_mesh_skinned" to="object_mesh_static"/>

	<!-- Textures -->
	<texture unit="0" name="albedo" anisotropy="1" shader="fragment" pass="deferred, ambient">core/textures/common/white.dds</texture>
  
</base_material>

The Vertex shader:

// Include Unified Unigine Shader Language (UUSL) header
#include <core/shaders/common/common.h>

// Input data struct
STRUCT(VERTEX_IN)
	INIT_ATTRIBUTE(float4,0,POSITION)	// Vertex position
	INIT_ATTRIBUTE(float4,1,TEXCOORD0)	// Vertex texcoord (uv)
END

// Our output vertex data struct
STRUCT(VERTEX_OUT)
	INIT_POSITION					// Out projected position
	INIT_OUT(float4,0)				// Texcoord (uv)
END

MAIN_BEGIN(VERTEX_OUT,VERTEX_IN)
	
	// Get transform with scale and rotation (without translation)
	float4 row_0 = s_transform[0];
	float4 row_1 = s_transform[1];
	float4 row_2 = s_transform[2];
	
	// Get Modelview-space transform
	float4 in_vertex = float4(IN_ATTRIBUTE(0).xyz,1.0f);
	float4 position = mul4(row_0,row_1,row_2,in_vertex);
	
	// Set output UV
	float4 texcoord = IN_ATTRIBUTE(1);
	OUT_DATA(0) = texcoord;
	
	// Set output position
	OUT_POSITION = getPosition(position);
MAIN_END

The fragment shader:

// Include the UUSL language header
#include <core/shaders/common/fragment.h>

// Adds a texture sampler
INIT_TEXTURE(0, TEX_COLOR)

STRUCT(FRAGMENT_IN)
	INIT_POSITION				// Projected position
	INIT_IN(float4,0)			// Texcoord (uv)
END


MAIN_BEGIN(FRAGMENT_OUT, FRAGMENT_IN)
	
	// Get the UV coords
	float2 texcoord = IN_DATA(0).xy;

	// Get the texture data
	float4 macro, macro_u, macro_r, macro_ur;

	float4 fragColor = TEXTURE(TEX_COLOR, texcoord);

	OUT_COLOR = fragColor;
	OUT_COLOR.a = 1.0f;

MAIN_END

 

[fox]

Hi uzadov,

try replacing the following lines in your fragment shader:

	// Get the UV coords
	float2 texcoord = IN_DATA(0).xy;

	// Get the texture data
	float4 macro, macro_u, macro_r, macro_ur;

	float4 fragColor = TEXTURE(TEX_COLOR, texcoord);

with these ones:

	// Get the UV coords
	float4 texcoord = IN_DATA(0);

	float4 macro, macro_u, macro_r, macro_ur;
	
	// Get the texture data
	float4 fragColor = TEXTURE(TEX_COLOR,texcoord.xy);

This should help!

Thanks!

[uzadow]

Hi Fox,

thanks for your support!

Unfortunately, I just tried your suggestion, and there is no change. The quad is rendered in black.

To check if the tex coordinates are correct,  I output them:

OUT_COLOR = float4(texcoord.x, texcoord.y, 0, 1);

This gives me the expected color gradient on my quad. Right now I'm assuming that for some reason, it can't access the texture. Does that make sense?

[silent]

Could you please provide an newly created project and your shaders with required textures and sources for debugging? It's hard to say what is going on here.

Thanks!

[uzadow]

Sure, no problem. Since it fails to upload here, I've placed the reproducer at:

https://www.libavg.de/owncloud/index.php/s/dzm1SfDcrq4KBCq

If you open the world file in the editor and navigate to materials, there is a test.basemat material. It should render a white texture, but it renders black. It does render white if I hardcode that in the shader.

[fox]

Hi uzadow,

Seems like the problem was in your material file, try removing a space in this line in the pass list (after the comma between "deferred" and "ambient"):

<texture unit="0" name="albedo" anisotropy="1" shader="fragment" pass="deferred,ambient">core/textures/common/white.dds</texture>

Thanks!

[uzadow]

Yep, that was it. Thanks for the quick and precise support!

A follow-up question: Is there a way to debug situations like this ourselves? Did I miss an error message somewhere?

[fox]

Glad that everything is ok! Normally, all messages, warnings and errors are displayed in the console. However, looks like this one was an exception,  sorry for any inconvenience caused!

Thanks!